Furnace.



D'. B. HOWARD.

FURNACE.

APPLICATION FILE-D MAY 3,1916.

' Patented J My 17, 1917'.

2 SHEETSSHEET ln. B. HOWARD.

FURNACE. APPLICATION man MAY a, 1916.

Patented July 17, 1917.

2 SHEETS-SHEET 2.

DONALD B. HOWARD, 0F DES MOINES, IOWA.

FURNACE.

Specification of Letters Patent.

Application filed May 3, 1916. Serial No. 95,284.

To all whom it may concern:

Be it known that I, DONALD E. HOWARD, a citizen of the United States, residin at Des Moines, in the county of Polk and tate of Iowa, have invented a new and useful Furnace, of which the following is a specification.

My invention relates to certain new and useful improvements in hot air furnaces especially designed to be constructed of material such as wrought iron, as distinguished from cast metal furnaces of this character.

My objects are to promote economy in the construction of furnaces of this kind by minimizing the number of pieces ofwrought metal in the construction of the furnace body proper, to thereby minimizethe number of riveted joints necessary in its construction, and further in this connection it is my object to provide a furnace body substantially horseshoe shaped, thus eliminating the necessity for providing chutes at the fuel door leading to the fire box and ash pit, while at the same time retaining all of the advantages incident to the use of such chutes, and to prevent the cast iron furnace front from becoming excessively heated or burned out.

' A further object is to provide a construction for the forward, upper portion of the furnace proper for connecting a circular arched furnace top with the cast iron furnace front in a facile and economical manner.

A further object is to provide improved means for connecting the furnace casing and the furnace front, whereby in the event a leak should occur between the front of the furnace casing and the furnace front, the escaping gases or smoke will be prevented from entering into the air heated chamber,

thus avoiding any possibility of having these escaping gases or the smoke enter the rooms being heated.

A further object is to provide improved means for increasing the heating qualities of the furnace without increasing the size of the furnace or its casing.

My invention consists in certain details in the construction, combination and arrangement of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1' shows a front elevation of a furnace embodying my invention, with the cas ing removed.

Fig. 2 shows a horizontal, detail, sectional view taken from a point above the grate looking downwardly, and illustrating the connection between the furnace front and the casing, and also illustrating the means for keeping the burning fuel on the grate spaced apart from the furnace front.

Fig. 3 shows an enlarged, detail View illustrating the means of connecting together the transverse bar near the top of the furnace body with the outwardly turned flanges of the furnace sides.

Fig. 4=-shows an enlarged, detail, sectional view on the line H of Fig. 3.

Fig. 5 shows a side elevation of the furnace with parts broken away to show the interior construction, the casing and furnace front being shown in section.

Fig. 6 shows a front elevation of the fur nace body.

Fig. 7 shows a transverse, sectional view looking downwardly, taken on the line 77 of Fig. 5, and

Fig. 8 shows a detail, sectional view illustrating the connections between the furnace body, the furnace top,and the furnace front.

Referring to the accompanying drawings, I'have used the reference numeral 10 to indicate the furnace body. This is made of a single sheet of wrought iron, it is approximately horseshoe shape in cross section, and at its front it is provided with outwardly extending flanges 11. ,The furnace top, indicated by the numeral 12, is of the customary dome shape, and is circular in form.

In order to connect this circular dome with the horseshoe shaped body in an economical, durable and convenient manner, I provide a wrought iron filling plate 13, which is riveted to the front of the dome 12 and which extends downwardly and forwardly and is provided with a downwardly extending flange 14: extended straight across its lower edge. By having this filling plate shaped and arranged at a downwardly and forwardly inclined angle, it tends to relieve the furnace front at the top from becoming overheated, because this filling plate resists the fire better than if it were arranged in a substantially horizontal plane in line with thetop of the dome. In order to connect this flange 14 with the furnace front, I provide awrought iron cross piece 15, (Fig. 3) which is inclined downwardly and out- Patented July 1'7, 19117.. i

, wardly at its ends at 16 to fit the correspondingly inclined part of the upper end of the flange 11. These parts where they overlap are preferably beveled as shown at 17 in Fig. 4:, and are connected together by the rivets 18. All of these parts are very readily and easily shaped and constructed and there is relatively little riveting required. All of these parts are made of the same ma terial, preferably wrought iron, so that all of them have the same 'coe'fficient of contraction and expansion, hence there is little likelihood ofdeveloping cracks or leaks at the riveted joints.

i The furnace front, indicated generally by the reference numeral 19,,is preferably made of cast iron in the ordinary manner, and surrounding the entire'furnace body is the ordinary furnace casing 20. The connection between the furnace casing and the furnace front is made as indicated in Figs. 2 and 8 by interposing a layer of asbestos paper or the like 21 between the flang s 11 at the sides,andthe cross piece flanges 14 at the top, and then placing the furnace front 19 against the front surface of said asbestos packingand connecting it by means such as bolts 22. The coeflicient of expansion between the case Inetal front and the wrought iron furnace body is different, and hence some packing material is preferably provided for. these joints. However, if :any leakage or gasor smoke should occur, the construction is such that the gas or smoke l Pass o t to h ex io of h f n casing instead of inside of it as in ordinary furnaces. Therefore it will not pass into the aircirculating chamber of the; furnace.

By constructing the furnace "may of a singlev piece ofwrought iron and making substantially horseshoe shaped instead of round as s ord nar yone, I g n a d cided advantage in that I avoid the necesit of; p i d ns h es eadin m the fuel door opening to the interior of the fur- I nace body and from the ash door opening to the' e eptacle e ev t e gra n Order to eeempl h the s m purpos in my f n as isacconiplished in other furnaces by the use of these chutes, I provide a grate 23 havme near f -Qnta sol d gear ca e d above this gear case I preferably placea wee h ati g ham er 25 f or na y' struction. This gear case and the water chanibertogether, or the gear case alone cone fine, the fire surface of thegrate so that heat from the fire is kept from direct contact with; the furnace front between the fuel door and the grate, and hence the heat from the fire is kept from the fuel door proper and the furnace front adjoining it inthesame manner astho ugh aseparate, chute, were providedi at the fuel door, and at. the same time fhev oi ed the ne e ity -P v g entra pieces for the fuel chute, and have avoided all of the disadvantages of extra pieces connected by rivets at these parts of the furnace which are subjected to great heat. In this connection there is also a great economy in construction of the furnace because there is no necessity for a separate chute being formed adjacent to the ash door. Although at this point there is no particular advantage in so far as keeping the heat away from the furnace front is concerned, yet there is an advantage in that a larger ash pit is provided and the necese sity of providing an extra chute adjacent to the ash door is avoided.

Communicating with the furnace body proper is a radiator 26 of ordinary construction, having the smoke discharge pipes 27 and 28 leading from it to a point of discharge,

In order to increase the air heating qualities of my furnace without increasing the size of the combustion chamber or of the furnace casing, have )rovided two radiating wings 29, preferably made of wrought iron and extending from the ends of the radiatorv 26 to a point near the hunace front, as illustrated in Fig. 2 where the wings are connected to the furnace body by bolts 30/ These radiating wings are sub stantially the same size vertically as the radiator, shown in Fig. 5. They are located substantially midway between the furnace body and the casing. They are of advantage in heating the air in my improved furnace, because the heat that radiates from the coinbustion chamber strikes them and heats them. by radiation, so that the air that impinges these wings 29 on both the outer and inner surfaces thereof, is heated by convection. Furthermore these wings form circulation lines which tend to accelerate. the movement of the air over the heated furnace surfaces and over said wings.

In Figs. l and 5 the fuel door is, indicated by the numeral 31, and the, ash door by the numeral In the construction of my improved fur-. nace I preferably form the furnace body and other parts excepting the furnace front, of wrought iron, but do not desire to, be understood as being limited to the use of this particular metal.

I I claim as my invention:

1 In a furnace, the combination of a furnace body portion, a dome-shaped top, a filling piece secured. to the front portion of the top and also to the sides of the body portion, and inclined from the top downwardly and forwardly, and a cross piece secured to the forward edge of said filling piece and tothe sides of the furnace at the front thereof. I

2, In a furnace, the combination of a fur: nace body, portion formed. of sheet or plate metal, substantially horseshoe shaped in crosssection, a circular dome shaped, top, a

messes a filling piece riveted to the front portion of the said flanges at the side of thebody porthe top and also to the sides of the body tion and the said filling piece, and a furnace portion and inclined from the top downcasing surrounding the body portion and wardly and forwardly, the front edge of secured to the rear surface of the outwardly said filling piece being formed with a de extending flanges at the front of the furnace pending flange, the side edges of the furnace body portion, whereby any leakage of gas or body at the front being formed with outsmoke that occurs between the furnace front wardly extending flanges, and a cross piece and the body portion will not enter the space riveted to the flange of the filling piece, for within the interior of the furnace casing.

10 the purposes stated. 5. In a furnace, the combination of a fur- 3. In a furnace, the combination of a furnace body portion formed of sheet or plate nace body portion formed of sheet or plate metal, substantially horseshoe shaped in metal, substantially horseshoe shaped in cross section, a circular dome shaped top, a cross section, a circular dome shaped top, a filling piece riveted to the front portion of filling piece riveted to the front portion of the top and also to the sides of the body porthe top and also to the sides of the body portion and inclined from the top downwardly tion and inclined from the top downwardly and forwardly, the front edge of said filling and forwardly, the front edge of said filling piece being formed with a depending flange, piece being formed with a depending flange, the side edges of the furnace body at the 29 the side edges of the furnace body at the front being formed with outwardly extend front being formed with outwardly extending flanges, a cross piece riveted to the flange ing flanges, a cross piece riveted to the of the filling piece, a furnace front secured flange of the filling piece, and afurnace front to the said flanges at the side of the body secured to the said flanges at the side of the portion and the said filling piece, a furnace 25 body portion and the said filling piece. casing surrounding the body portion and 4-. In a furnace, the combination of a fursecured to the rear surface of the outwardly nace body portion formed of sheet or plate extending flanges at the front of the furnace metal, substantially horseshoe shaped in body portion, said front being also secured cross section, a circular dome shaped top, a to the front face of the said cross piece,

30 filling piece riveted to the front portion of whereby any leakage of gas or smoke that the top and also to the sides of the body poroccurs between the furnace front and the tion and inclined from the top downwardly body portion will not enter the space within and forwardly, the front edge of said filling the interior of the furnace casing.

piece being formed with a depending flange, Des Moines, Iowa, February 13, 1915. 5 the side edges of the furnace body at the DONALD B. HOWARD.

front being formed with outwardly extend- -Witnesses: ing flanges, a cross piece riveted to the flange A. SHERMAN, of the filling piece, a furnace front fitted to J. MAHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

